England have beaten South Africa, Fiji and Argentina in their autumn Tests and, while Youngs knows Australia have also improved over the course of the Rugby Championship and European tour, he insists his side now bristle with attacking intent.

England won 3-0 in Australia in the summer

"I believe we have layered on another level to our attack since then," Youngs said. "In the first four-and-a-half minutes against Argentina, until Elliot Daly went off, we were causing them trouble.

"We looked flat, we looked fast and we looked like we were on top of them. We had those guys turning in and the ball was going out the back, when they were drifting we were hitting short.

England defence coach Paul Gustard says the injury to Billy Vunipola gives other players a chance to prove the squad's strength in depth

England defence coach Paul Gustard says the injury to Billy Vunipola gives other players a chance to prove the squad's strength in depth

"Our manipulation of their defence was good and we had to adapt when Elliot was sent off, so our tactics changed slightly.

"Saturday is another step forward for our attack and I do feel we are a lot better side than the summer. I'm sure they feel the same."

England are hoping to equal the national record of 14 successive Test victories set by Sir Clive Woodward's World Cup winners by toppling Australia and Youngs believes the biggest threat to their ambitions is complacency.

"We spoke about complacency last week," he added. "All our prep had been great and the only thing stopping us from having a great performance against Argentina was a complacency mindset.

Jonny May scores a try for England against Argentina

"Sometimes you do the greatest prep and think it's just going to happen, then it doesn't. You can do the greatest prep but you've still got to go out and execute it.

"There's going to be no chance of complacency. We are 100 per cent focused on getting all four victories and this is our chance to do that. We haven't pumped Australia up as bigger than any of the other games, we simply said we feel there's more to come as a side.

Will Greenwood looks back at England's victory against Argentina and predicts a tough test against Australia on Saturday

Will Greenwood looks back at England's victory against Argentina and predicts a tough test against Australia on Saturday

"We want the best performance to come at the weekend because we feel we haven't quite delivered in some aspects of our play. We haven't blown it up anything more than just trying to get our best performance out there."